Heat sink



FIG. 1 is a perspective view of the heat sink embodying the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof, the left side being the mirror image thereof;

FIG. 6 is a perspective view of a second embodiment of the heat sink embodying the new design;

FIG. 7 is a top plan view thereof;

FIG. 8 is a rear elevational view thereof;

FIG. 9 is a front elevational view thereof;

FIG. 10 is a right side elevational view thereof, the left side being the mirror image thereof;

FIG. 11 is a perspective view of a third embodiment of the heat sink embodying the new design;

FIG. 12 is a top plan view thereof;

FIG. 13 is a rear elevational view thereof;

FIG. 14 is a front elevational view thereof; and,

FIG. 15 is a right side elevational view thereof, the left side being the mirror image thereof.

The bottom of the heat sink forms no part of the claimed design.

The broken line showing of supports in FIGS. 1, 4-6, 13, 16-18, 25, and 28-30 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for heat sink, as shown and described. 